package com.example.OJ.utils;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/oj_database?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "xxxxxxxxx";

    private static DataSource dataSource = null;

    public static DataSource getDataSource(){
        if(dataSource == null){
            synchronized (DBUtil.class){
                if(dataSource == null){
                    MysqlDataSource mysqlDataSource = new MysqlDataSource();
                    mysqlDataSource.setURL(URL);
                    mysqlDataSource.setUser(USERNAME);
                    mysqlDataSource.setPassword(PASSWORD);
                    dataSource = mysqlDataSource;
                }
            }
        }
        return dataSource;
    }

    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }

    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet) {
        //
        try{
            if(resultSet!=null){
                resultSet.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
        }
        //
        try{
            if(statement!=null){
                statement.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
        }
        //
        try{
            if(connection!=null){
                connection.close();
            }
        }catch (SQLException e){
            e.printStackTrace();
        }



    }
}
